The other cover from same correspondence was SEND PER BRITISH PACKET, with pair of 40c (small faults) cancelled by "NIMES 12 JUIN 67" c.d.s, "PD" corrected by "PP", London Paid (15.6.67) transit, and scarce oval "COLON DEBE DE ULTRAMAR" with 10 centavos postage due.
A VERY RARE DESTINATION, AS PAIR SHOWING BOTH ROUTES PROBABLY UNIQUE.